Consider this situation :
Two drivers need to decend a snow covered hill , Driver A , we'll call him David , decends as though it is wet pavement , 4x4 engaged ( it's OK on wet pavement remember ) , and the transmission in D .
The truck accelerates down the hill as it would on wet pavement , at the bottom David slams on his brakes and waits for the ABS system to engage bringing him to a stop .
The problem with relying on ABS is that you lose control of the situation because unlike on pavement , on snow , the pulsing of the ABS does not really have a chance to get enough traction during the braking portion of the pulse because the wheels are locked and sledding on the snow .
Driver B , we'll call him Randy Bachmann , has driven in something other than sand before , recognizes the difficulty and potential risks involved with driving in snow , engages 4x4 , and selects 3 or 2 for the tranny , drives the truck down , with throttle and not brakes , and because the speed of the vehicle has been reduced due to the conditions presented , can safely brake at the bottom of the hill . ABS should not engage , but if it does , rather than stamping the brake pedal harder to the floor , Randy lets it up , corrects steering , and re-applies the brakes softly .
Repeat as necessary .
Granted , in this video the hill is covered in ice , and you don't stand much of a chance especially with wheels not turning , with ABS or otherwise , but if you fast forward to the 1:30 mark , to the tacoma coming down the hill in control , I guarantee you that guy has it in 4x4 ( maybe 4L ) , has a low gear selected and is giving it gas , and driving down the hill . He doesn't touch his brakes once .